Headlight for motor-vehicles.



F. F. MAcLEAN.

HEADLIGHT FOR MOIOR VEHICLES.

APPLICATION mu) I'EB.I7.191G. RENLWED ocr. 24, 1918.

1,292,840. Patented Jan. 28, 1919.

INVE/VTDI? B %mm4 $611M UNITED STATESv PATENT OFFICE.

FREDERICK F. MAULEAN, SYRACUSE, NEW YORK, ASSIGNOR, BY MESN'E ASSIGN- MENTS,'OF ONE-HALF T0 LUCIUS G. LACY, 0F SYRACUSE, NEW YORK.

HEADLIGHT FOR MOTOR-VEHICLES.

Specification of Letters Patent.

Patented Jan. 28, 1919.

. Application filed February 17, 1916, Serial No. 78,982. Renewed October 24, 1918. Serial No. 259,571.

- county of Onondaga, in the State of New York, have invented new and useful Improvements in Headlights for Motor-Vehi-- cles, of which the following, taken in connection with the accompanying drawings, is a full, clear, and exact description:

This invention relates to certain improvements in headlights for motor vehicles and is somewhat similar to that set forth in my pending application, Serial No. 11,677, filed March 3, 1915, in that it makes use of a turning connection between the lamp base and socket for use in connection with a lamp bulb similar to that set forth in my Patent No. 1,146,268, issued July 13, 1915, in which a portion of the bulb is coated to prevent excessive horses, pe hicles.

In lamps of this character, it is necessary to not only provide for the proper focusing of the light, but also to enable the bulb to be adjusted independently of the focus adjustestrians and drivers of other vement to bring the coated portion of the bulb at the proper side of the focal axis, and the.

main objectof my present invention is to provide for this adjustment without in any way affecting the focus or intensity of the light.

One of the specific objects is to simplify, and at the same time, to increase the efficiency of the turning connection between the base of the lamp and bulb in holding the bulb against accidental turning and permitting it to be readily turned by hand to the desired position to properly position the coatin 'with reference to the focal axis of the re ector with which the lamp is usually used.

Other objects and uses will be brought out in the following description.

In the drawings-- Figure 1 is a side elevation of my improved headlight showing a portion of the glare in the eyes of approaching.

tached rin by which the lamp base is connected to t e socket.

Fig. 5 is a perspective view of the detached lamp base and adjacent portion of the bulb.

Fig. 6 is a transverse sectional view, similar to Fig. 3, showing a modified form of bonnecting ring.

Fig. 7 is a perspective view of the detached rin shown in Fig. 6.

The hea light comprises a reflector -1- and a co-axial lamp comprising a bulb 2 having a suitable base 3 and a socket 4, the latter being provided with an externally threaded portion -5 screwing. into an internally threaded hub 6 of the reflector 1. i

The lamp is provided with any suitable electrically incandescing filament 2 adapted to be connected in the lamp circuit through the medium of the usual centerand-mm contacts, commonly used for producing a light of definite intensity from a storage battery or other comparatively low voltage source of electric energy, not shown.

The lamp base is provided with a metal sleeve or casing having an annular groove -7 for receiving a split ring 8 which is fitted to turn therein and is held against endwise movement by the portions of the base -3 at the ends of the annular groove -7, thus permitting the bulb to be turned in the ring about its axis without changing the focus or intensity of the light.

As shown in Figs. 1 to 5, inclusive, the ends of the ring at the division are bent slightly inwardly to form nibs 8 which,

under the tension of the ring, are adapted to frictionally engage the periphery of the base 3 within the groove 7, thereby preventing accidental turnin of the lamp ulb when onceadjusted by' and, it being understood that although the rin 8' is frictionally engaged with the periphery of the lamp base -3, the bulb may be readily turned by hand within certain limits, as hereinafter described.

The means for limiting the turning movement of the base 3 in the ring consists of a stop pin 9- projecting radially from the base -3, and preferably midwa between the ends of the groove 7, as s own more clearly in Fig. 5.

The ring -8- is provided with a circumfcrentially extending slot 10-- for receivbase with the ring 8 thereon is inserted in the socket and the ring interlocked with thesocket in the manner described, the pin 9 will be held in its interlocking engagement by the tension produced by the center contacts, one of which is usually spring-tensioned toward the other in .a manner not necessary to herein illustrate or describe, because such contacts are well known in this art..

In Figs. 6 and 7,1 have shown a modified form of rin 13 of slightly greater circumferentiaTlength than a half circle adapted to fit within the annular roove 7- to turn therein, and is tensione so as to frictionally bind u on the base 3 to prevent accidental turning, the ends of the ring being spaced some distance apart to receive between them the radially projecting pin 9- on the lamp base and to cooperate therewith for limiting the turning movement of the lam bulb when the ring is interlocked with t esocket -4.

The screw connections 5 and 6 between the socket and hub of the reflector enable the lamp to be properly adjusted relatively to the focusof the reflector, but when once adjusted relatively to said focus, it renaeaeec socket for receiving the same, of a split ring rotatably mounted on the lamp base and provided with inturned nibs frictionally engag- 1n ho ding said ring against axial movement relatively to the lamp base, and interlocking connections between the ring and socket.

2. The combination with a lamp base and a socket for receiving the same, said base being provided with an annular groove, of a split ring fitted in said groove to turn therein, means for limiting the turning movement of the rin relatively to the base, and detachable inter ocking connections between the ring and socket.-

3. The combination with a lamp base and asooket for receiving the same, of connec tions between said base'and socket for permittin the lamp to be turned relatively to the soc et without changing the focus or'intensity of the light, and means for limiting the turnin movement of the base relatively to the soc et.

In witness whereof I have hereunto set my hand this 15th day of February, 1916.

FREDERICK F. MACLEAN.

Witness H. E. Gen.

g the periphery of. the base, means for 

